Physics Question from JEE Main 2023 · 31 January, Shift 2

A water heater of power $2000 \, \text{W}$ is used to heat water. The specific heat capacity of water is $4200 \, \text{J kg}^{-1} \, \text{K}^{-1}$. The efficiency of the heater is $70\%$. Time required to heat $2 \, \text{kg}$ of water from $10^\circ \text{C}$ to $60^\circ \text{C}$ is ........ $\text{s}$.